Fix SSR Decider for Bots

[ganemone]

Previously we were returning true from the SSRDecider for all requests with a
user agent matching a bot. This caused issues when handling non GET routes.
This updates the logic to also check for the request method === GET.

[codecov]

Codecov Report

Merging #371 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #371   +/-   ##
=======================================
  Coverage   93.23%   93.23%           
=======================================
  Files          18       18           
  Lines         458      458           
  Branches       91       91           
=======================================
  Hits          427      427           
  Misses         17       17           
  Partials       14       14

Impacted Files	Coverage Δ
src/plugins/ssr.js	91.17% <100%> (ø)	⬆️

---

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[codecov]

Codecov Report

Merging #371 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #371   +/-   ##
=======================================
  Coverage   93.23%   93.23%           
=======================================
  Files          18       18           
  Lines         458      458           
  Branches       91       91           
=======================================
  Hits          427      427           
  Misses         17       17           
  Partials       14       14

Impacted Files	Coverage Δ
src/plugins/ssr.js	91.17% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4ef36ea...0530311. Read the comment docs.

[codecov]

Codecov Report

Merging #371 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #371   +/-   ##
=======================================
  Coverage   93.23%   93.23%           
=======================================
  Files          18       18           
  Lines         458      458           
  Branches       91       91           
=======================================
  Hits          427      427           
  Misses         17       17           
  Partials       14       14

Impacted Files	Coverage Δ
src/plugins/ssr.js	91.17% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4ef36ea...0530311. Read the comment docs.

[ganemone]

!merge

[old-fusion-bot]

Triggered Fusion.js build verification: https://buildkite.com/uberopensource/fusion-release-verification/builds/1760